Mobile phone accessory



FIG. 1 is a perspective view of a mobile phone accessory showing my design;

FIG. 2 is a left side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof. 

The ornamental design for a mobile phone accessory, as shown and described. 